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/*
* Copyright 2014-2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.metrics.topology.cli;
import java.util.List;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.apache.karaf.shell.commands.Command;
import org.onosproject.cli.AbstractShellCommand;
import org.onosproject.event.Event;
import org.onosproject.metrics.topology.TopologyMetricsService;
import org.onosproject.net.topology.TopologyEvent;
/**
* Command to show the list of last topology events.
*/
@Command(scope = "onos", name = "topology-events",
description = "Lists the last topology events")
public class TopologyEventsListCommand extends AbstractShellCommand {
private static final String FORMAT_EVENT = "Event=%s";
private static final String FORMAT_REASON = " Reason=%s";
@Override
protected void execute() {
TopologyMetricsService service = get(TopologyMetricsService.class);
if (outputJson()) {
print("%s", json(service.getEvents()));
} else {
for (Event event : service.getEvents()) {
print(FORMAT_EVENT, event);
if (event instanceof TopologyEvent) {
TopologyEvent topologyEvent = (TopologyEvent) event;
for (Event reason : topologyEvent.reasons()) {
print(FORMAT_REASON, reason);
}
}
print(""); // Extra empty line for clarity
}
}
}
/**
* Produces a JSON array of topology events.
*
* @param events the topology events with the data
* @return JSON array with the topology events
*/
private JsonNode json(List<Event> events) {
ObjectMapper mapper = new ObjectMapper();
ArrayNode result = mapper.createArrayNode();
for (Event event : events) {
result.add(json(mapper, event));
}
return result;
}
/**
* Produces JSON object for a topology event.
*
* @param mapper the JSON object mapper to use
* @param event the topology event with the data
* @return JSON object for the topology event
*/
private ObjectNode json(ObjectMapper mapper, Event event) {
ObjectNode result = mapper.createObjectNode();
result.put("time", event.time())
.put("type", event.type().toString())
.put("event", event.toString());
// Add the reasons if a TopologyEvent
if (event instanceof TopologyEvent) {
TopologyEvent topologyEvent = (TopologyEvent) event;
ArrayNode reasons = mapper.createArrayNode();
for (Event reason : topologyEvent.reasons()) {
reasons.add(json(mapper, reason));
}
result.set("reasons", reasons);
}
return result;
}
}
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